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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cff71f573c6b57183f160c84d5bd951ec7f0b5f1d5e84e727e95c4d290de59e8' 
  AND token = 'orMWuJ80dsfdsckBx7xJ6dMivAo68kCXBLUUuVWC8LI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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