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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e8d67677eb05f2715dc42b950869e5372113fecfa2da16534d79cdfc383c3d7' 
  AND token = 'TDxtW4nczIyHVjYrtyacinbcXaUHZfz6nlj5W5R1QbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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