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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cadc802d8802e6cc7094804a25964eb6ce7d56f089fba7ad728a3d6251d7f145' 
  AND token = 'FnwaMCnk9e4ZmOldAw4tQSICbGJXCer87z1jD31CF98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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