SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd8d902b15a6ef0f5ca576d7c7b507a1035950a878f6294e18542da4c947162d' 
  AND token = '65kBsBxCZgpz/pXgbi93MtT5qlaATGQ1YQVvIKfCrIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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