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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c36f416419bc1ec399a0c9c60772f4c4ff91fead60c4c9cbc5f613d6c2c558b' 
  AND token = '6vMtOtznV2fx5Rk1xfoK43kURwrO2dz30uokFedpM/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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