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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4c601f057947ecaa8f6dc3d471f24eefac2d06cd0ffa9e9b0ab9437a9b0f5c8' 
  AND token = 'S+prrpuUq/7ysfCyB9SiiAimOLgEb7Vyg5IqRC6VjGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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