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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd690673f76e7cc8e4036a81eeee33b075d5c9256e03aeee0193e48f4eb007882' 
  AND token = 'xv7/TH6QUf5jRea77iF7EUK5WRbXR/XiuQr7TTXHTVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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