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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb0feb89986ef81d69c4f8ff8693ebe363634692802becf1ac01341ef0121707' 
  AND token = 'HFl5YRH7Y9I7n6q1w7OlazaazH0eVoGeDS8j0Zt46/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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