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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48d6284108199a4d650e74ef0c94aae01e14cc1eefbf602ceedecaf4341cba8f' 
  AND token = '2VJMFGt3iWKjVV7VNodBXIVe7l7hHFeR/7XT2x/5SRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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