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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'add9d8c125bad80c4b2c76d08e22f89dedc0ae0e63b7466b71d9376a2efaa826' 
  AND token = 'GxDt0bUZ30/5U1J9K7BwljpXtRH1Atas9h6BlBzh880=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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