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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6552f894094efa1c04069293cfe1875b928638564f00aea4fd1e46030237e2ad' 
  AND token = 'LfrN2MpoO1xKV1heNPxn+jjtlYSPStYOW+Li/6p6ASk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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