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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f261184eb0852d41b86114813f5f7cb667f69874d6f72bf2f7725358c06cebe' 
  AND token = 'VB1pS+WS8bbdZKyk4Nuo0f5d3e9uYDPHsI6qJ8ubUBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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