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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06363fdd89176f7ec9ad10e83477ce37dc04fbbfc6c7a7d36c0c12b60f4c9b15' 
  AND token = 'kEmL131fs0HlK5FezevWwRzBwk6ulbdkggZZvI04dQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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