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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ca66ebb36d49f8758b3a7ef4a6c10f153b485a2908b313292a45d178e5434d2' 
  AND token = 'gS7Hz07Huu6jy2n/KgqSWrRBrLWfk1zvcvWrLE4GeIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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