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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8cab49061cfcaec03a0ea26961fff6da4b80f152014df1a708b24924e88a7a4' 
  AND token = 'mH6xWflic2fj45HpTiKlO06fUZspt5SxVCdI5svOI2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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