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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b494441f0aea3046299e38696d59e9e29b4ebbbaae3f5897fcdb5cf26026af08' 
  AND token = 'J4sTRI6AzVrucHVjqhGa0qRVE/lWg4E1GP7uu+1b6qA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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