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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0773e1d36771bfa9b572b96eca61d449b8ffffbbe3feeec1495c3516ad61ea0a' 
  AND token = 'KbefWaKAqimyT/7N+VAKESkUhDjbXxYV1jRdgEZ0Jmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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