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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3aa687a6eda084bbff5fb101a3a280939d18f113794c4e785fb7a54edf657b3' 
  AND token = 'DNWgM/wmi0JERTPdMA1ywGc4z0fttbKlDQePA3Nkm3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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