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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b079486bc248d483ad2479fb9e3598bb266bfb8efd308b8ff67703bdd8f3b1f' 
  AND token = 'VmCrqjDzoO24hMHHOpJG5OC5oW6isjxt/U9/kmeeYdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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