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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06fe7950e72409cf90bfb0d06334533079d1edd993179119c348d744ad8c65e9' 
  AND token = 'R83a1DI+dTarcsF409gw8GObUsK17p9+pRYfGjOXlJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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