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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33829482261156779b8f86528079158372ea6d1a005c3861085cf9ba8c8394a1' 
  AND token = '99/aRXbY/z3FpONsrI/v72aT9GR8xZHmF+pHP80iKZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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