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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db9064ffef3392a73f6121db00e0d05686509a913f1be3dd982ccc7b40d3861e' 
  AND token = '9QDpNyf6pCA1RfcfhKXl/ShxZPT8KahQi6wqsyaN55o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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