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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0995a4fbae999a8bd5b88a1fae31e959131196c07f6a01fe8741ecba18f8c059' 
  AND token = '27LEHR8Z2mGUDFhErLxEZfXlM1W1YphYEZP3ebADkbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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