SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd805ed29a458c199a98bbc0981a3ed95c81896e5c7bc793bbc442f34ab9032d1' 
  AND token = 'VJgpE+VjYKFEZeJRGArHgZhl7Pz1VkJegQm8EX8vvoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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