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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db3ecbc2cc5a24986f238c25bbb29356a6576de7ff1587c52dc81b0af34cfb6c' 
  AND token = '5cqBFspDkjfIoig6QlQUPB7sMhz7VA8pcs5mrnzDPp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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