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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b4bb108d95a4da602ce78527e3058b120320568e9d1353763436de99442926b' 
  AND token = 'stt9wuso5bS8G60ja/rv66RrMH5ZBq+UmAoG2n3KI+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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