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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '011dd5f78f24dea3dbccab9cc1a472d9de79e42e6a3a791078f50d7192b74fa6' 
  AND token = 'etbA4KVu7LtMsr2f5p4WG7DHbJ6qEIq01B7aSl9vGlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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