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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '165aeae7e8b3f7015dc9fc90731d5065d3c7ccdb5babf7a6e236d82b1d5b38f9' 
  AND token = '6grURPIi7UK9odI7Pmc75OW0QuyldmBDmyjhV1xOh/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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