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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09e8ba2eb1f12deb2410a48dc9d0edd03f5a7b1b9b7e1efb497b0029d51f5ab4' 
  AND token = '00CMleSgxGlk39pSebXzAgiE4ftj7eP2nVuWYRTE1rU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}