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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3eb0e1a7143f8e199ac327cee6b7d5807f7e13450a19e8a89e5a876d8f5dae50' 
  AND token = 'acprQNdo+Jn3QxREMOdPFBzEYjEPqcVJys9RGqWtT+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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