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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fbcc2dff716f84701feb60078bdeae01c32384ae4fa36d30b6980b2a4f67a22' 
  AND token = 'AjAIu2e0uU2CIJ0NlOvsQFWZo0SddJ54w9Ji2HwGrXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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