SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4df92dd7759dcebc8cc7504aa25a4e9b57780496c5a93a69d5938f8fad373ce5' 
  AND token = 'v+tF9ja/KQ03LLgiHZFrzfyKPDWkgvz0qmwXRe1S5JA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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