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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f24dd0a9c344ab8eacd4ecaab438f86b71c331f798f3dfaa5c27887f743929c' 
  AND token = 'XmnqB3GHELvkp+72a+OP34/zu9KZ0ERAUDtv6lzE2ks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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