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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9acbefd35c9259d433f564e1d9b48cbe98424b3d0d58850102237ee106c24013' 
  AND token = 'x3buEzzUGnb++F2895bX6daw+eo+lLlxLxi/eA/9/wM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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