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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0169126f8d58189c005348dd88c7405a5891bf84c94ca1f6a7e26ad4276e9e52' 
  AND token = 'z9rv1WRrMiH3Zk0NAuStvFKFSmml2maruvcOs1IcdaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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