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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31e572a49ebb68ddf1ed42f7594c27375bcb3b6f2be70cc2ee09daaa52b5882d' 
  AND token = 'm7nNf1SI8Cu+nYsdnrR73VxSDXLYhQAx1VBxggDgfXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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