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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b4ff236873e1db45a593f35269a4299ae4f96453d1c612a9e8d9c5c178a062a' 
  AND token = 'tQoEWcziT4xCqypmNUOLSAc/FpY8mp/p4gmXPc2NjzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00126

JSON explain

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