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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bece96f8a555cd123fbc42a61c514785525df681d45c4a923a26e3d5e5ef36d' 
  AND token = '3poIbXdobExq0yMHVndlnO7jDPTnJpKbL/kUul7djAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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