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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '986a4f27a7657771374b706b5e4eecdfa74940b0fe1552375eaec11506e77826' 
  AND token = 'EFbuGww9YhI09usXU7ElarC8qO2cFsFWzXgznxH8Oqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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