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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4ba3d08a9953c6edd9e64a13de4a160a8d738e061bfaf84ce2acbbda83781a1' 
  AND token = 'S3u6Ncv9n7QksV3ouJroy9mX2i9Mze6IwK9CBT+uUIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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