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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4aefc33ba0ae605b6a46e2f2f3e3bdcccabba0a4adc64f4096e7e009527f2511' 
  AND token = '6QK+TsLgTKVnopNByjfyaW99WJIV3QOnyQp4mpA2fsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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