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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92dcef6fbb174ca5759571085acae3b18c4d07e8a4d43fc01ccc804e43d30a0e' 
  AND token = 'lK9aLnarmfLiXvQrvxYWKh5MKDtn+gO/ol1XJ8ASHx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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