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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2cfa3ed7f853c24ee37f46963674f7b635007df01cb77b724ffae7016918f95' 
  AND token = 'U8frup1roseNm8VOjdGNXv1VqvV2zCMp/224cZmompk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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