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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa8d7c1fb588f71d2fedd3c448dead855bcc3dcf1af9548a27c8e625ee4e2b64' 
  AND token = '6n4aeQnPR39o8x4ldFMq2ZKnMsYNRzIuCKt8qOwKBzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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