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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c6f89d80617001820e8c2aa978e75502f423f517ccb0e952ddeb5c256df89df' 
  AND token = 'qKr7D8OlR0n5jMBYDpln7RedJwpxxKQt+zixn2y5ZQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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