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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c47bf7eacf286c62a071ff5725a20ba9f89cba8d4132b97e103914de7672ba35' 
  AND token = 'IfTMa35lefwhzFVkcww33mT5sENqsk6BtLwj4X5f82Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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