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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2989386f01e2ff837a83208d51842a61a024b9405b7632f2c277df50bf8a6dfe' 
  AND token = 'TywLIf1lcH84cnryp4ZFjdkv+B6G2jB6JA+0XJI2F/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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