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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31e25471df9f1a6d5120356396ff70595f9efd4f770a7ff0bbda41ca0c6acd70' 
  AND token = '4Eubs2J/BL/8bBLGGIIHdSO0MNOBHO+g8WCeW1l1c98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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