SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d2b1c37cbdfc25757dba81e239d4f7c4626c89c680f99869dca9481d5f23ee7' 
  AND token = 'nogPZt+PKCmPzAGjEV4PLIcHyoctjFHJ7hbwiqfiESY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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