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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6feda006a59403f3b8310478ceb250fe5e0ca1b5a9e2e2980d94f85963bd6672' 
  AND token = 'T2CfDBo4cithC5xq4Iljbe4oq06V84maHAta0iWzNYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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