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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32e39697201d6d315fe315b093cdd300d69205b0f07e59d8b4d7ced04a724731' 
  AND token = 'DGWCGz41hLd1WqehJozhvqgJjr0v/sy7NBfr3Waud4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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