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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35a79a716a41f89448111688f20b759c24012e2f51cb51440486fd3728896511' 
  AND token = 'cItuubeAr1MSuGWGsmk1A4ed3IEe2+RjfTrvMLijbZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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