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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40bf2e6f4a7024254d7821de30307642da57e6145c92ef581c3a3297df5ac216' 
  AND token = 'mVkkuxpV+U0yLQhw83+tgdL2ft1Cc/Lg1TaHEGf+XCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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