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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6a068041932f0b27beac8d19206f4ad43ca39587ec9c0338a12f6552145354e' 
  AND token = 'A9raD+SPcyPsEBvHkQ/E41s3GjBft3708OLsZL8FDEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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