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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79b2f8684d5bd361127765da0f098c1cac3c6e49189477e680dbb4fbd727e038' 
  AND token = 'X798Y2cx/e5FEBciSobMpJNUZ72GW3FyZ+LL3Yiz3QM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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