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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbb5bcb16afa2849dcc90cc7474e50a5ff8b1857931b2c7a1d7600d5902278a0' 
  AND token = '+n9Aurzb3QiIAdqjD7agqz8zbjxMvF6l1TqyW2xpExw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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