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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7372f69391487bc05e515b833b61610332f94e01056124f77b6a264cc3107cb9' 
  AND token = 'edtP1ArfIuvnQ9yJD3gnn5rdcmq6xD8uFNzyLBAThuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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