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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c829eaedd376b6422ea921f695aff4e7998669cdef59f0d25929f76223aab0ec' 
  AND token = '08raVSo4asrPkuT/fjsyhW5aks/p38UCVSmjHJSssO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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