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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '443d610dc245ccaa9c27e2c85ffea6d3dec04ba31ee1107bde58b7dcef07dbc3' 
  AND token = '7oFdzMkNOe5xs9Ji6AEruSgTJTzUvtOR5RQoEUSE56s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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