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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c753c9d29a310afeac5326812d191cea35c37470f77912a79d17a230ba90969' 
  AND token = 'sQqGJ8/CkGVn2KAQkq6irJRCBifoOYDrb05C/7xYmn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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