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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4982e3b0ab3fcef8daad5f5e2b9023c1cb9c587113ec5f1188493c6e5c9d5b78' 
  AND token = 'zssUitxpx07jDEq3A1Zqdlj5Cik19MypVbuAhaM1viE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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