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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08ad7389f09be1612c4da4357b87fd91ddf9a8c14da9e36406316fc7a8bda026' 
  AND token = '1sPkwakEZcTwrOt6rmY5eE4FJ37h/bNqIQUhqyiIrxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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