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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5053f28450bf1d9b8ed8f8080e08e6de7503758cba6b2adb869f4f2688a4890f' 
  AND token = 'ABywAIhxonGoxy4MopcDL2oirfAgjWJKOeF3RkThhcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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