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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '791a3862d94c1352dbbcb8547a8c0bd2b3c5b56f08c48b2ba0af385fe3f15b40' 
  AND token = 'c/nJhsOsYu4VVH6wvdfWEeRaUgV7gh1KzEISY3cfCAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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